Wiring DLC (ALDL)
#1
Wiring DLC (ALDL)
I recently bought an lt1 -94 engine, but the DLC (ALDL) is not connected. I’ve been looking around on the internet but I can’t find how it should be.
I found a good illustrating picture from shbox.com
I have three cables on my DLC. B, M and A.
A is ground, but I don’t know where B and M should go. Do you guys know where they should be connected?
I found a good illustrating picture from shbox.com
I have three cables on my DLC. B, M and A.
A is ground, but I don’t know where B and M should go. Do you guys know where they should be connected?
#2
Supreme Member
iTrader: (24)
Join Date: Jun 2005
Location: NC
Posts: 7,883
Likes: 0
Received 58 Likes
on
42 Posts
Car: 92 Firebird
Engine: Supercharged 6.0
Transmission: T56
Axle/Gears: 8.8 3.73
Re: Wiring DLC (ALDL)
C207 pin E - ALDL B - PCM Blue 20
C207 pin J - ALDL M - PCM Blue 30
Ive tested this on 90-92, 87 and 87 harnesses to reuse the stock 3rd gen OBDI ALDL
If you have a different year, test the pins with a multimeter or simply run a new ALDL. I would not use the OBDII connector with a 94 PCM. It requires a special cable to even have codes pulled
C207 pin J - ALDL M - PCM Blue 30
Ive tested this on 90-92, 87 and 87 harnesses to reuse the stock 3rd gen OBDI ALDL
If you have a different year, test the pins with a multimeter or simply run a new ALDL. I would not use the OBDII connector with a 94 PCM. It requires a special cable to even have codes pulled
#5
Supreme Member
Join Date: May 2004
Location: Kingston, Tn
Posts: 2,924
Likes: 0
Received 1 Like
on
1 Post
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Re: Wiring DLC (ALDL)
I have 4 on mine, Serial Data, two grounds and a 12v constant which is pins 4, 5, 9 and 16 on the OBDII port
#6
Supreme Member
iTrader: (24)
Join Date: Jun 2005
Location: NC
Posts: 7,883
Likes: 0
Received 58 Likes
on
42 Posts
Car: 92 Firebird
Engine: Supercharged 6.0
Transmission: T56
Axle/Gears: 8.8 3.73
Re: Wiring DLC (ALDL)
OBDI cars are easier to reuse the stock connector. The signal inputs are PCM controlled, which are the C207 hookups. All 12v constant, IGN and grounds are already in place
#7
Supreme Member
Join Date: May 2004
Location: Kingston, Tn
Posts: 2,924
Likes: 0
Received 1 Like
on
1 Post
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Re: Wiring DLC (ALDL)
Actually, the stock 3rd gen connector doesn't have 12v constant in it, only in the 4th gens with an OBDII connector, but mine is a '95 motor and had the OBDII cable end so that's what I went with, the 12v powers up the serial adapter I have to read the codes and program the PCM instead of having to run a power cable to the cig lighter.
Last edited by Klortho; 01-24-2010 at 11:12 AM.
Trending Topics
#8
Re: Wiring DLC (ALDL)
So I have a 92 RS and am going to be swapping a 93 LT1. How many wires does my current ALDL have? I have the daignostic request signal wire from the LT1 (C220 Pin C) and the Serial Data wire (C100 pin D) labeled. What will these take place of?
Thread
Thread Starter
Forum
Replies
Last Post